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Title:
PREPARATION METHOD OF TUNGSTEN CARBIDE SINTERED BODY FOR FRICTION STIR WELDING TOOL
Document Type and Number:
WIPO Patent Application WO/2013/018957
Kind Code:
A1
Abstract:
The present invention relates to a preparation method of a tungsten carbide sintered body for a friction stir welding tool used in a friction stir welding tool of a high melting point material such as steel, titanium and the like or a dissimilar material such as aluminum, magnesium-steel, titanium and the like using pulsed current activation through a discharge plasma sintering apparatus. The preparation method comprises the following steps: filling a tungsten carbide (WC) powder in a mold made of a graphite material; mounting the mold filled with tungsten carbide powder in a chamber of a discharge plasma sintering apparatus; making a vacuum inside of the chamber; molding the tungsten carbide powder while maintaining a constant pressure inside the mold and increasing the temperature according to a set heat increase pattern until the temperature reaches a final target temperature; and cooling the inside of the chamber while maintaining the pressure pressurized in the mold after the molding step. According to the preparation method of a tungsten carbide sintered body for a friction stir welding tool, it is possible to obtain a high relative density of 99.5% or higher, and to prepare a uniform sintered body having a homogeneous tissue with little particle growth, high toughness, high abrasion resistance and high strength within a short time by a single process when preparing a tungsten carbide sintered body appropriate for a friction stir welding tool by using pulsed current activation through a discharge plasma sintering apparatus. In addition, since a sintered body is prepared with only a tungsten carbide single material, excluding a sintering additive such as cobalt, a preparation method is simplified, preparation costs are reduced, and toughness, abrasion resistance and strength are superior compared with a sintered body containing cobalt, a sintering additive.

Inventors:
PARK HYUN KUK (KR)
OH IK HYUN (KR)
YOON HEE JUN (KR)
SON HYEON TAEK (KR)
LEE KWANG JIN (KR)
BANG HEE SEON (KR)
BANG HAN SUR (KR)
Application Number:
PCT/KR2011/009519
Publication Date:
February 07, 2013
Filing Date:
December 09, 2011
Export Citation:
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Assignee:
KOREA IND TECH INST (KR)
PARK HYUN KUK (KR)
OH IK HYUN (KR)
YOON HEE JUN (KR)
SON HYEON TAEK (KR)
LEE KWANG JIN (KR)
BANG HEE SEON (KR)
BANG HAN SUR (KR)
International Classes:
B22F3/12; B22F3/105; C04B35/56; C04B35/645
Foreign References:
KR20090041148A2009-04-28
KR20080102786A2008-11-26
KR20050081149A2005-08-18
KR970017739A1997-04-30
Attorney, Agent or Firm:
LEE, Jea Ryang (KR)
이재량 (KR)
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Claims: